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Yarway Desuperheaters PED/ATEX O&SI User guide

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YARWAY NARVIK DESUPERHEATERS
PED/ATEX - OPErATing AnD SAfETy inSTrucTiOnS
WARNING
For safety reasons, it is important to take the
following precautions before you start work
ontheDSH*:
1. Read all labels fitted to the DSH* and
this sheet before installation, operation
ormaintenance.
2. Use DSH* for the intended purpose (according
contract/specification).
3. Remove the DSH* carefully from its
packaging, lifting by means of straps (heavy
weight) around the body.
4. Do not use the water inlet connection, yoke,
actuator or any of its accessories for lifting.
5. For installation of the DSH* use gaskets
and bolting material in accordance with the
relevant piping code (ASME/ B31.1 or EN) and
free of ‘forces, moments and torques’.
6. Additional mounting/modifications on DSH’s*
are not allowed without approval from Yarway.
7. The line must be depressurized, drained,
vented and cooled down before installation.
8. Handling of all DSH’s*, actuators and
accessories must be carried out by personnel
trained in all aspects of manual, mechanical
handling/lifting techniques and standard
safety procedures, in case of doubt, consult
your Supervisor and/or safety officer.
9. Yarway does not accept liability for site work
performed under supervision of others.
10. Each DSH’s* water supply line should
be protected with its own strainer with a
maximum element perforation size of 0.1 mm.
11. Insulate the DSH* in accordance with
plantrequirements.
12. Please, follow the procedure as detailed in
theIOM**.
13. The surface temperature as defined
in 2014/34/ECAnnex II 2.2.1.2 of the
Desuperheater is a function of the system
it is built into. When installed, the surface
temperature cannot be controlled by the
manufacturer.
Before installation these instructions must be fully read and understood
!! Read all warning labels fitted to the DSH*
before operation or maintenance !!
Never open, dismantle or modify the assembly
whilst under pressure/temperature or other
hazardous conditions.
NOTE
DSH* = Desuperheater
IOM** = Installation, Operation and
Maintenancemanual
VCOSI-03351-EN 15/12
INSTALLATION
1. Place the DSH* with the gasket onto the
mounting flange and insert the nozzle
carefully into the branch pipe.
2. Ensure that the spray nozzle assembly is
pointed with the direction of the steam flow
before tightening the mounting bolts.
3. Installation may be vertical or horizontal
piping (use support in case of heavy weight),
but the direction of water injection should
always be with the steam flow.
4. When there are positive shut-off
components in the water supply (including
electric actuators) then a safety relief
valve, of an approved type, should be fitted
(seeexample in the IOM**).
5. Connection of electrical supplies and/or
air piping should be in accordance with
themanufacturer’s instruction manual.
6. Verify and adjust, if necessary, set
points for air filter regulator and valve
positioner, following the manufacturer’s
recommendations.
7. When satisfactory co-ordination between
signals and temperature are attained,
adjustment of the set point can be made
and the system transferred to automatic
operation.
8. Ensure easy access of the operating
mechanism (actuator, positioner,
handwheels, etc.) if applicable.
CATEGORY
DSH’s* are manufactured in accordance with
2014/68/EC.
Pressure/temperature limits are indicated:
# on the DSH* nameplate
# design code: ASME B16.34, EN 12516 or
ASME B31.1
# on the actuator name plate
Emerson.com/FinalControl © 2017 Emerson. All rights reserved.
2
YARWAY NARVIK DESUPERHEATERS
PED/ATEX - OPErATing AnD SAfETy inSTrucTiOnS
NOTE
DSH* = Desuperheater
IOM** = Installation, Operation and
Maintenancemanual
FINAL INSPECTION
Y
arway DSH’s* have been tested, degreased,
dried and prepared according to service
application. This should be carried out in
accordance with the relevant Yarway’s IOM**
and available upon request by: Yarway via our
website: www.valves.emerson.com
STATE OF DELIVERY / STORAGE /
SELECTION/ SERVICE LIFE
State of delivery
Yarway’s DSH’s* are delivered with protection
and tested according applicable QPF (Quality
Planning Form). Particular care should be
exercised when removing the DSH* from
its packaging and your special attention is
required to check carefully that no damage has
occurred to flange faces, threading, actuators,
connecting pipes, etc. before installation. Check
out IOM** - instructions before proceeding.
Storage
For short term storage, up to 6 months, no
additional preservation is necessary. Retain
the DSH* in its original packaging in a clean,
dry indoor location. For long term storage, use
only a dry indoor location. Follow instructions
given in the IOM** before placing the DSH* into
service, replace stem packing and inspect other
components to ensure correct functioning.
SPARE PARTS
Use only genuine Yarway components.
AllDSH’s* are identified by an identification
number, stamped on the identification plate.
Use this number when ordering spare parts.
Selection
Ensure that DSH’s* material of construction
and pressure/temperature limits shown on the
identification plate and according to the suitable
code for the process conditions. If in doubt,
contact Yarway or your localrepresentative.
Service life
Expected service life may vary upon condition of
service. Check unit at least once per 8000 hours
or longer intervals based upon site experience.
© 2017 Emerson. All rights reserved.
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